A telephone company estimates that the number N of phone calls per day
between two cities of population and that are miles apart is given by:
115. Estimate the population of a city given that
. . . . . the population of a second city is: ,
. . . . . the number of phone calls per day is: ,
. . . . . and the distance between the cities is: miles.
. . . Round to the nearest thousand.
First, solve for
We have: .